Question

我第一次尝试使用滑块组件，然后立即出现一些问题：

如何使滑块与TickMark的位置对齐？
- 如果不可能的话，它们是干什么的？
- 如果要滑动而不会步进，如何更改标记数量或删除所有标记？
为什么当我更改“滑块轨道”设置时，视觉效果无法调整？

我已经看到这进入了功能请求；）

Answer 1

这些问题最好作为MRTK github页面上的问题提出。 here's a link to file an issue。

但是，在这里为将来的访问者回答您的问题：

如何使滑块与TickMark的位置对齐？

默认的PinchSlider不提供该功能，但这是通过扩展pinchslider来实现此功能的示例（参考：issue 4140

public class SliderWithSnapPoints : PinchSlider
    {
        [SerializeField]
        [Tooltip("The number of snap points")]
        float snapPoints = 100;

        float lastSnapPoint;
        float snapPointSize;

        public override void OnPointerDown(MixedRealityPointerEventData eventData)
        {
            base.OnPointerDown(eventData);
            if (eventData.used)
            {
                lastSnapPoint = SliderValue;
                snapPointSize = 1f / snapPoints;
            }
        }

        /// <summary>
        /// Handle slider value changes by dragging, and commit these changes.
        /// </summary>
        /// <remarks>
        /// Note, this requires the MRTK pinch slider to implement this function signature,
        /// and the pinch slider needs to call this function instead of instead setting SliderValue 
        /// directly.
        /// </remarks>
        protected override void OnPointerDragged(float newSliderValue)
        {
            var valueChange = Mathf.Abs(lastSnapPoint - newSliderValue);
            if (valueChange >= snapPointSize)
            {
                lastSnapPoint = SliderValue = newSliderValue;
            }
        }
    }

如果要滑动而不会步进，如何更改标记数量或删除所有标记？

您可以删除或禁用场景层次结构中的刻度线。

为什么当我更改“滑块轨道”设置时，视觉效果无法调整？

视觉效果不会调整，因为它们与捕捉点的数量无关，它们只是提供视觉指导。

Answer 2

我稍微修改了此实现：

using Microsoft.MixedReality.Toolkit.UI;
using UnityEngine;

public class SliderWithSnapPoints : PinchSlider
{
#pragma warning disable 649
    [Tooltip("The number of snap points")]
    [Min(2)]
    [SerializeField] private int snapPoints = 5;
#pragma warning restore 649

    /// <summary>
    /// Handle slider value changes by dragging, and commit snap point aligned changes.
    /// </summary>
    /// <remarks>
    /// Note, this requires the MRTK pinch slider to implement this function signature,
    /// and the pinch slider needs to call this function instead of setting SliderValue 
    /// directly.
    /// </remarks>
    protected override void OnPointerDragged(float newSliderValue)
    {
        float gap = 1f / (snapPoints - 1f);
        newSliderValue = 0.5f * gap + newSliderValue;
        newSliderValue -= (newSliderValue % gap);

        SliderValue = newSliderValue;
    }
}

正如评论所建议的那样，您还必须从以下位置编辑主要的PinchSlider脚本：

public void OnPointerDragged(MixedRealityPointerEventData eventData)
{
    if (eventData.Pointer == activePointer && !eventData.used)
    {
        var delta = activePointer.Position - startPointerPosition;
        var handDelta = Vector3.Dot(SliderTrackDirection.normalized, delta);

        SliderValue = Mathf.Clamp(startSliderValue + handDelta / SliderTrackDirection.magnitude, 0, 1);

        // Mark the pointer data as used to prevent other behaviors from handling input events
        eventData.Use();
    }
}

收件人：

public void OnPointerDragged(MixedRealityPointerEventData eventData)
{
    if (eventData.Pointer == activePointer && !eventData.used)
    {
        var delta = activePointer.Position - startPointerPosition;
        var handDelta = Vector3.Dot(SliderTrackDirection.normalized, delta);

        OnPointerDragged(Mathf.Clamp(startSliderValue + handDelta / SliderTrackDirection.magnitude, 0, 1));

        // Mark the pointer data as used to prevent other behaviors from handling input events
        eventData.Use();
    }
}

protected virtual void OnPointerDragged(float newSliderValue)
{
    SliderValue = newSliderValue;
}

如何配置PinchSlider？

2 个答案: